Times of Salaah

Joining salaahs when travelling

Q: Is it permissible to join the salaahs when a person undertakes a journey and is a musaafir? 

For example, you are leaving a country and it is zuhr time, so before the flight, you join zuhr and asr? Or you visited a country and you go to a shop and maghrib time sets in, so you read maghrib and esha together. Is this permissible, and if not, does one get a sin when they do it?

Combining salaahs due to illness

Q: Can I combine my prayers? I have a urine condition where if I go to the toilet, then after a few minutes, I feel that there is a drop of urine coming out.

Due to this condition, I try to not go to the toilet in the daytime so that I can perform my prayers, but it is a painful process to suppress your need to relieve yourself.

Can I combine my Zohr and Asr prayers and then perform the Esha prayer with Maghrib?